Piece of skull, showing hole produced by trephination with obsidian knife, experiment by Dr T. Wilson Parry, England, 1913 Piece of skull used in a trephination experiment with an obsidian knife, England, 1913 1913
Piece of skull showing holes produced by trephination with hafted shark's tooth, experiment by Dr T. Wilson Parry, England, 1913 Piece of skull showing a trephination experiment using a shark's tooth, England, 1913 1913
Piece of skull of 21 year old male showing hole produced by trephination with flint scraper, experiment by Dr T. Wilson Parry, England, 1913-1920 Piece of skull showing a trephination experiment with flint, England, 1913-1920 1913-1920